const formatTime = date => {
  const year = date.getFullYear()
  const month = date.getMonth() + 1
  const day = date.getDate()
  const hour = date.getHours()
  const minute = date.getMinutes()
  const second = date.getSeconds()

  return `${[year, month, day].map(formatNumber).join('/')} ${[hour, minute, second].map(formatNumber).join(':')}`
}

const formatNumber = n => {
  n = n.toString()
  return n[1] ? n : `0${n}` // '0' + n
}

module.exports = {
  formatTime,
  judgeGrade
}

const judgeGrade = (score) => {
  if (score >= 90) {
    return '优秀';
  } else if (score >= 80) {
    return '良好';
  } else if (score >= 70) {
    return '中等';
  } else if (score >= 60) {
    return '及格';
  } else {
    return '不及格';
  }
};